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When wearing camo shorts, what color T-shirt would go well on top?
Literal
Camo [genitive-の] shorts [object-を] wear case, top [topic-は] what color [genitive-の] T-shirt [subject-が] match [polite-question-ますか]?
Everyday fashion advice question. 履く is the specific verb for wearing items on the lower body (pants, shoes, socks) — distinct from 着る (upper body, suits), かぶる (hats, helmets), つける (accessories). 場合 here functions as 'in the case of X-ing.' 合う ('to match, go well with') is a common verb in fashion and dining contexts.